Pressure type high-temperature thermochemical heat storage tank system and working method thereof

Abstract

The invention discloses a pressure type high-temperature thermochemical heat storage tank system and a working method thereof, which are suitable for a gas (steam)-solid reversible reaction system such as Ca (OH) 2 / CaO + H2O. The system comprises a reaction storage tank, a surge tank, a water storage tank, a booster pump, a vacuum pump, a cooler, a reaction steam pipeline, a vacuumizing pipeline, a steam generation pipeline, a cooling spraying pipeline, a drain pipeline and valves corresponding to the pipelines. The pressure type reaction storage tank is used for increasing the equilibrium temperature of the reversible chemical reaction and increasing the heat storage temperature, the pressure of the reaction storage tank is stabilized through evaporation or condensation of water and water vapor in the surge tank, the water storage tank is used for storing liquid water needed by the system, and the water level of the surge tank is balanced in a draining or pressing pumping mode. Storage and release of high-temperature heat energy are achieved, and the heat storage and release process is completely decoupled. The system does not need conveying of reaction materials, and long-term heat energy storage can be achieved. The system is simple and can be used for large-scale heat energy storage.

Description

technical field [0001] The invention relates to an energy storage system, in particular to a pressure-type high-temperature thermochemical heat storage tank system and a working method thereof. Background technique [0002] Energy storage is an important technical field in the current energy system, and heat storage technology is an important aspect of it, especially for solar thermal power generation and other fields, it plays a vital role. At present, large-scale thermal energy storage is still dominated by sensible heat storage. Sensible heat storage technology is simple and easy to implement, but the heat storage density is low, high-temperature heat storage materials are expensive and have high requirements for use, and long-term storage of thermal energy cannot be realized. Therefore, its application effect and scale are limited to a certain extent. Thermochemical heat storage utilizes reversible thermochemical reactions to store thermal energy in chemical bonds such ...

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Problems solved by technology

However, due to the complexity of the chemical heat storage system, the reaction system needs to transport a large amount of reaction materials, which need to be mechanically transported, pneumatically transported, or fluidized bed. The sensible heat change process and phase transition process of the reaction materials have brought greater difficulty, so there is no mature application system yet

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